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Making the world better, one answer at a time. the top of a sand dune is called the crest of the dune.
The longitudinal dunes in the Sahara Desert are more than 120 kilometers long and can reach as high as 200 meters. There are numerous hypotheses as to how exactly these dunes are formed, and research is ongoing to solve the mystery. The fifth type of sand dune is very unique. Star dunes are dunes with three or more ridges radiating from a center point. These dunes are formed in areas with large amounts of sand and strong winds that blow in a variety of directions over the course of a year.